for spy expiring on March 31

Next time you may wanna check the contract specs before asking such a simple question.

Last Trading Day:
Quarterly options are p.m.-settled contracts. The last trading day, therefore, is the last business day of each calendar quarter.
 
Quote from bibo:

Is March 30 is last day for trading or March 31?

the new option codes also contain the date of expiry,


RDQ100331C00117000

RDQ (10 03 31) C00117000

2010, Mar, 31
 
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